Stabilizing/destabilizing the large-scale circulation in turbulent Rayleigh-Bénard convection with sidewall temperature control

Zhang，Shengqi1; Chen，Xin2; Xia，Zhenhua3; Xi，Heng Dong2; Zhou，Quan4; Chen，Shiyi1,5

2021

10.1017/jfm.2021.58

JOURNAL OF FLUID MECHANICS   影响因子和分区

0022-1120

1469-7645

In this paper, we designed two different configurations with locally isothermal sidewalls, where the temperature is set to be the bulk temperature, to control the large-scale circulation in turbulent Rayleigh-Bénard convection, namely two-point control and four-point control. At fixed Rayleigh number and Prandtl number, a series of direct numerical simulations are performed on both two-dimensional (2-D) and quasi-two-dimensional (quasi-2-D) cavities with both types of control, where the width of the control area is fixed at and the vertical distance from the cavity centre varies from 0 to 0.45 with an interval of 0.05. Our results show that the control effect depends on, the control configurations as well as the flow dimensions. For 2-D cavities, both two-point control and four-point control suppress the flow reversal when, accompanied by the enhancement of vertical heat transfer and the strength of the large-scale circulation. For quasi-2-D cavities, the suppression of the flow reversals is obvious with two-point control and, while the effect is rather limited with four-point control. Further experiments with and up to show that two-point control with can effectively suppress the flow reversal, while two-point control with can suppress the reversals at low and activate them at higher, which agrees well with our numerical simulations.

Bénard convection

SCI ; EI

英语

通讯

WOS:000626643500001

20211110073502

Numerical models ; Prandtl number ; Two term control systems

Heat Transfer:641.2 ; Control Systems:731.1 ; Mathematics:921

ENGINEERING

2-s2.0-85102270463

Scopus

1.State Key Laboratory for Turbulence and Complex Systems,Peking University,Beijing,100871,China
2.Institute of Extreme Mechanics and School of Aeronautics,Northwestern Polytechnical University,Xi'an,710072,China
3.Department of Engineering Mechanics,Zhejiang University,Hangzhou,310027,China
4.Shanghai Key Laboratory of Mechanics in Energy Engineering,Shanghai Institute of Applied Mathematics and Mechanics,School of Mechanics and Engineering Science,Shanghai University,Shanghai,200072,China
5.Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Zhang，Shengqi,Chen，Xin,Xia，Zhenhua,et al. Stabilizing/destabilizing the large-scale circulation in turbulent Rayleigh-Bénard convection with sidewall temperature control[J]. JOURNAL OF FLUID MECHANICS,2021,915.

Zhang，Shengqi,Chen，Xin,Xia，Zhenhua,Xi，Heng Dong,Zhou，Quan,&Chen，Shiyi.(2021).Stabilizing/destabilizing the large-scale circulation in turbulent Rayleigh-Bénard convection with sidewall temperature control.JOURNAL OF FLUID MECHANICS,915.

Zhang，Shengqi,et al."Stabilizing/destabilizing the large-scale circulation in turbulent Rayleigh-Bénard convection with sidewall temperature control".JOURNAL OF FLUID MECHANICS 915(2021).